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Claws Out: Fiddler Crabs Do Battle

Smithsonian Tropical Research Institute
Male fiddler crabs each have a single super-sized claw that they use as a weapon to threaten and fight other males and as beautiful adornment to attract females. Here, see a video of two male dancing fiddler crabs (Uca terpsichores) battle for territory. The male on the left has no burrow of his own—and no mate—while the male on the right tries to defend his own. The crabs with two small claws that look like they're twiddling their thumbs are females picking microscopic food from the sand. And what happens at the end? The battle-losing burrowless male follows a female into her burrow—not to mate, but to try to oust her and take over her home. Read more about the evolution of fiddler crabs' beautiful and powerful claws at this blog post on the Smithsonian Ocean Portal: Footage taken by Ana Endara at Culebra Beach in the Republic of Panama as part of John Christy's research into the evolution of fiddler crab claws with the Smithsonian Tropical Research Institute. Music by © 2008 Kevin MacLeod (Creative Commons 3.0)

The Fiddler Crab Uca burgersi

Smithsonian Tropical Research Institute
Fiddler crabs are a common sight around the Bocas del Toro Research Station. They can be seen near the main lab building, as well as by the dock and mangroves. Watch for the waving movements of the big claw that the males use to attract females. This movement makes them look as if they were playing a fiddle, thus the name Fiddler Crabs. Video by: Rachel Collin Smithsonian Tropical Research Institute Bocas del Toro Panama 2012

Fiddler and Porcelain Crabs Feeding

Smithsonian Marine Station at Fort Pierce
We just added several new fiddler crabs to the Mangrove Ecosystem! Many people think that male fiddlers use their large claw to capture food. After watching this video, what do you think? At the end you will also see footage of a porcelain crab filter feeding...check out that current!

Fiddler Crab Strategies for Timing Reproduction Across Temperature Variation

Smithsonian Tropical Research Institute
Fiddler crabs and many other marine organisms have strong cycles of courtship and larval hatching that are linked with the tidal amplitude cycle. Kecia Kerr studies fiddler crabs to determine how intertidal organisms maintain precisely timed larval hatching across large temperature changes. This video shows footage of courting males from 2 different species of fiddler crabs found in Panama, Uca terpsichores and U. deichmanni. Video and text by: Kecia Kerr Edited by: Rebecca Rissanen Collin Lab Smithsonian Tropical Research Institute, Panama, 2011 Research in the Collin Lab focuses on the evolution of life histories and development of marine invertebrates. Our current work, supported by the US National Science Foundation, uses marine slipper limpets (Calyptraeidae) to try to understand the evolutionary loss and possible reacquisition of feeding larvae. The Collin Lab is located in Panama City, Panama, at the Smithsonian Tropical Research Institute's Naos Marine Laboratories, but our field work takes us to various other countries in the Americas. We hope that the videos on this YouTube channel give you an introduction to the faces in the Collin Lab, as well as a taste of the kinds of projects we are working on.

Why the Size of a Male Fiddler Crab's Claw Matters (4K)

Smithsonian Channel
There are millions of fiddler crabs on the shores of the Sanibel lagoons. The males, in particular, are recognizable by their large outsized claw - used for everything from attracting mates to punching their rivals. From the Series: The Living Beach: Florida
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